Measurements were taken for the workstation that tests the test machines; the data is: Mean 118.45 Standard Dev 0.35 Lower Spec 117.56 Upper Spec 119.73 Determine the capability index. (Keep four decimal places in your answer)

Measurements were taken for the workstation that tests the test machines; the data is:

Mean 118.45
Standard Dev 0.35
Lower Spec 117.56
Upper Spec
119.73

Determine the capability index. (Keep four decimal places in your answer)

 

Solution

Mean = 118.45

Standard deviation = 0.35

Lower specification limit (LSL) = 117.56

Upper specification limit (USL) = 119.73

Cpl = (Mean – LSL) / (3 x standard deviation)

= (118.45 – 117.56) / (3 x 0.35)

= 0.89 / 1.05

= 0.8476

Cpu = (USL – Mean) / (3 x standard deviation)

= (119.73 – 118.45) / (3 x 0.35)

=

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